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In China, early tin was extracted along the Yellow River in Erlitou and Shang times between 2500 and 1800 BC. By Han and later times, China imported its tin from what is today Yunnan province. This has remained China's main source of tin throughout history and into modern times. [49]
Additionally, some alchemists and astrologers believed there was an association, sometimes called a rulership, between days of the week, the alchemical metals, and the planets that were said to hold "dominion" over them. [27] [28] There was some early variation, but the most common associations since antiquity are the following:
Tin is a chemical element; it has symbol Sn (from Latin stannum) and atomic number 50. A silvery-colored metal, tin is soft enough to be cut with little force, [13] and a bar of tin can be bent by hand with little effort. When bent, the so-called "tin cry" can be heard as a result of twinning in tin crystals. [14]
Tin foil was once a common wrapping material for foods and drugs; replaced in the early 20th century by the use of aluminium foil, which is now commonly referred to as tin foil, hence one use of the slang term "tinnie" or "tinny" for a small aluminium open boat, a small pipe for use of a drug such as cannabis, or for a can of beer. Today, the ...
In one problem which sought to determine the height of the Sun from the Earth and the diameter of the Sun, Chen Zi (Chinese: 陳子) instructs Rong Fang (Chinese: 榮方) to wait until the shadow cast by the 8 chi tall gnomon is 6 chi (one chi during the Han was 33 cm), so that a 3-4-5 right-angle triangle can be constructed where the base is ...
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Su Song's fourth star map places the position of the pole star halfway between Tian shu (−350 degrees) and the current Polaris; this was the more accurate calculation (by 3 degrees) that Shen Kuo had made when he observed the pole star over a period of three months with his width-improved sighting tube. [30]
Malaccan tin ingots in the National History Museum of Kuala Lumpur. Tin ingots (Chinese: 斗锡) were a trading currency unique to Malacca. Cast in the shape of a peck, or dou in Chinese, each ingot weighs just over 1 pound (0.45 kg). Ten blocks made up one unit called a small bundle, and 40 blocks made up one large bundle.